auto-detect JSON files and QEMU binaries on command-line
auto-detect JSON files and QEMU binaries on command-line

Make the script much easier to use.

Signed-off-by: Eduardo Habkost <50373d7c08ceadf576dd7dca718012445b677ce6@redhat.com>

ehabkost/gdb-qemu,ehabkost/gdb-qemu